You'll appreciate that HR is done through an app. If you want to quit you can literally do that on the app, no need to talk to anyone. Same with apply for the job, accepting your offer, etc. It's mostly computerized.
That said, it's not THAT hard to get through process, and something of the steps are just filter. We don't know the posters work history / capacity / etc. We do know amazon probably cares very little that this person made it only 3 minutes?
I did hear that for older workers they have a work hardening process during peak to try to harden up workers a bit more gradually to be able to handle full shifts.